compatible vs information processing system

compatible is not a noun while information processing system is a noun.

Word	Noun	Adjective	Verb	Adverb
compatible	No	Yes	No	No
information processing system	Yes	No	No	No

compatible (noun)	information processing system (noun)
	a machine for performing calculations automatically

compatible (adjective)	information processing system (adjective)
able to exist and perform in harmonious or agreeable combination
capable of being used with or connected to other devices or components without modification
capable of forming a homogeneous mixture that neither separates nor is altered by chemical interaction